307 lines
9.0 KiB
Go
307 lines
9.0 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package drain
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import (
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"errors"
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"fmt"
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"os"
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"reflect"
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"sort"
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"strconv"
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"testing"
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"time"
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corev1 "k8s.io/api/core/v1"
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policyv1beta1 "k8s.io/api/policy/v1beta1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/kubernetes/fake"
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ktest "k8s.io/client-go/testing"
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)
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func TestDeletePods(t *testing.T) {
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ifHasBeenCalled := map[string]bool{}
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tests := []struct {
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description string
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interval time.Duration
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timeout time.Duration
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expectPendingPods bool
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expectError bool
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expectedError *error
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getPodFn func(namespace, name string) (*corev1.Pod, error)
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}{
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{
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description: "Wait for deleting to complete",
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interval: 100 * time.Millisecond,
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timeout: 10 * time.Second,
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expectPendingPods: false,
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expectError: false,
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expectedError: nil,
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getPodFn: func(namespace, name string) (*corev1.Pod, error) {
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oldPodMap, _ := createPods(false)
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newPodMap, _ := createPods(true)
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if oldPod, found := oldPodMap[name]; found {
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if _, ok := ifHasBeenCalled[name]; !ok {
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ifHasBeenCalled[name] = true
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return &oldPod, nil
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}
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if oldPod.ObjectMeta.Generation < 4 {
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newPod := newPodMap[name]
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return &newPod, nil
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}
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return nil, apierrors.NewNotFound(schema.GroupResource{Resource: "pods"}, name)
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}
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return nil, apierrors.NewNotFound(schema.GroupResource{Resource: "pods"}, name)
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},
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},
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{
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description: "Deleting could timeout",
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interval: 200 * time.Millisecond,
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timeout: 3 * time.Second,
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expectPendingPods: true,
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expectError: true,
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expectedError: &wait.ErrWaitTimeout,
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getPodFn: func(namespace, name string) (*corev1.Pod, error) {
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oldPodMap, _ := createPods(false)
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if oldPod, found := oldPodMap[name]; found {
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return &oldPod, nil
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}
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return nil, fmt.Errorf("%q: not found", name)
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},
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},
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{
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description: "Client error could be passed out",
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interval: 200 * time.Millisecond,
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timeout: 5 * time.Second,
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expectPendingPods: true,
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expectError: true,
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expectedError: nil,
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getPodFn: func(namespace, name string) (*corev1.Pod, error) {
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return nil, errors.New("This is a random error for testing")
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},
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},
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}
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for _, test := range tests {
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t.Run(test.description, func(t *testing.T) {
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_, pods := createPods(false)
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pendingPods, err := waitForDelete(pods, test.interval, test.timeout, false, test.getPodFn, nil)
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if test.expectError {
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if err == nil {
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t.Fatalf("%s: unexpected non-error", test.description)
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} else if test.expectedError != nil {
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if *test.expectedError != err {
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t.Fatalf("%s: the error does not match expected error", test.description)
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}
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}
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}
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if !test.expectError && err != nil {
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t.Fatalf("%s: unexpected error", test.description)
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}
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if test.expectPendingPods && len(pendingPods) == 0 {
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t.Fatalf("%s: unexpected empty pods", test.description)
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}
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if !test.expectPendingPods && len(pendingPods) > 0 {
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t.Fatalf("%s: unexpected pending pods", test.description)
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}
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})
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}
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}
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func createPods(ifCreateNewPods bool) (map[string]corev1.Pod, []corev1.Pod) {
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podMap := make(map[string]corev1.Pod)
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podSlice := []corev1.Pod{}
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for i := 0; i < 8; i++ {
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var uid types.UID
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if ifCreateNewPods {
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uid = types.UID(i)
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} else {
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uid = types.UID(strconv.Itoa(i) + strconv.Itoa(i))
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}
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pod := corev1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: "pod" + strconv.Itoa(i),
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Namespace: "default",
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UID: uid,
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Generation: int64(i),
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},
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}
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podMap[pod.Name] = pod
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podSlice = append(podSlice, pod)
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}
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return podMap, podSlice
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}
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// addEvictionSupport implements simple fake eviction support on the fake.Clientset
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func addEvictionSupport(t *testing.T, k *fake.Clientset) {
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podsEviction := metav1.APIResource{
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Name: "pods/eviction",
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Kind: "Eviction",
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Group: "",
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Version: "v1",
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}
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coreResources := &metav1.APIResourceList{
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GroupVersion: "v1",
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APIResources: []metav1.APIResource{podsEviction},
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}
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policyResources := &metav1.APIResourceList{
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GroupVersion: "policy/v1",
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}
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k.Resources = append(k.Resources, coreResources, policyResources)
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// Delete pods when evict is called
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k.PrependReactor("create", "pods", func(action ktest.Action) (bool, runtime.Object, error) {
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if action.GetSubresource() != "eviction" {
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return false, nil, nil
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}
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eviction := *action.(ktest.CreateAction).GetObject().(*policyv1beta1.Eviction)
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// Avoid the lock
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go func() {
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err := k.CoreV1().Pods(eviction.Namespace).Delete(eviction.Name, &metav1.DeleteOptions{})
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if err != nil {
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// Errorf because we can't call Fatalf from another goroutine
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t.Errorf("failed to delete pod: %s/%s", eviction.Namespace, eviction.Name)
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}
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}()
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return true, nil, nil
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})
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}
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func TestCheckEvictionSupport(t *testing.T) {
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for _, evictionSupported := range []bool{true, false} {
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evictionSupported := evictionSupported
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t.Run(fmt.Sprintf("evictionSupported=%v", evictionSupported),
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func(t *testing.T) {
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k := fake.NewSimpleClientset()
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if evictionSupported {
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addEvictionSupport(t, k)
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}
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apiGroup, err := CheckEvictionSupport(k)
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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expectedAPIGroup := ""
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if evictionSupported {
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expectedAPIGroup = "policy/v1"
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}
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if apiGroup != expectedAPIGroup {
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t.Fatalf("expected apigroup %q, actual=%q", expectedAPIGroup, apiGroup)
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}
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})
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}
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}
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func TestDeleteOrEvict(t *testing.T) {
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for _, evictionSupported := range []bool{true, false} {
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evictionSupported := evictionSupported
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t.Run(fmt.Sprintf("evictionSupported=%v", evictionSupported),
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func(t *testing.T) {
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h := &Helper{
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Out: os.Stdout,
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GracePeriodSeconds: 10,
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}
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// Create 4 pods, and try to remove the first 2
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var expectedEvictions []policyv1beta1.Eviction
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var create []runtime.Object
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deletePods := []corev1.Pod{}
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for i := 1; i <= 4; i++ {
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pod := &corev1.Pod{}
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pod.Name = fmt.Sprintf("mypod-%d", i)
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pod.Namespace = "default"
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create = append(create, pod)
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if i <= 2 {
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deletePods = append(deletePods, *pod)
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if evictionSupported {
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eviction := policyv1beta1.Eviction{}
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eviction.Kind = "Eviction"
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eviction.APIVersion = "policy/v1"
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eviction.Namespace = pod.Namespace
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eviction.Name = pod.Name
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gracePeriodSeconds := int64(h.GracePeriodSeconds)
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eviction.DeleteOptions = &metav1.DeleteOptions{
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GracePeriodSeconds: &gracePeriodSeconds,
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}
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expectedEvictions = append(expectedEvictions, eviction)
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}
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}
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}
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// Build the fake client
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k := fake.NewSimpleClientset(create...)
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if evictionSupported {
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addEvictionSupport(t, k)
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}
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h.Client = k
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// Do the eviction
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if err := h.DeleteOrEvictPods(deletePods); err != nil {
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t.Fatalf("error from DeleteOrEvictPods: %v", err)
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}
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// Test that other pods are still there
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var remainingPods []string
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{
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podList, err := k.CoreV1().Pods("").List(metav1.ListOptions{})
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if err != nil {
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t.Fatalf("error listing pods: %v", err)
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}
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for _, pod := range podList.Items {
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remainingPods = append(remainingPods, pod.Namespace+"/"+pod.Name)
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}
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sort.Strings(remainingPods)
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}
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expected := []string{"default/mypod-3", "default/mypod-4"}
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if !reflect.DeepEqual(remainingPods, expected) {
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t.Errorf("unexpected remaining pods after DeleteOrEvictPods; actual %v; expected %v", remainingPods, expected)
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}
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// Test that pods were evicted as expected
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var actualEvictions []policyv1beta1.Eviction
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for _, action := range k.Actions() {
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if action.GetVerb() != "create" || action.GetResource().Resource != "pods" || action.GetSubresource() != "eviction" {
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continue
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}
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eviction := *action.(ktest.CreateAction).GetObject().(*policyv1beta1.Eviction)
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actualEvictions = append(actualEvictions, eviction)
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}
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sort.Slice(actualEvictions, func(i, j int) bool {
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return actualEvictions[i].Name < actualEvictions[j].Name
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})
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if !reflect.DeepEqual(actualEvictions, expectedEvictions) {
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t.Errorf("unexpected evictions; actual %v; expected %v", actualEvictions, expectedEvictions)
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}
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})
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}
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}
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